The featured iPad app is Loopy HD [Direct Link], which allows you to create music by layering loops that you record yourself. Fallon and Joel sang The Lion Sleeps Tonight, a song made popular in the 1960s by doo-wop group The Tokens. The pair sang different parts of the song in an amusing exchange that features a solo by Fallon and the always powerful vocals of Joel.

This isn't the first time the musical aspect of the iPad has taken center stage on Fallon's talk shows. In a 2010 Late Night With Jimmy Fallon episode that aired shortly after the original iPad was launched, Fallon invited English New Wave band Squeeze to the stage, with keyboardist Stephen Large splitting his performance between a Roland VK-8 and an iPad.